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sent by (output started at [ROOT]/includes/functions.php:3823) - View topic - Volume 2, Errors and Omissions

There seems to be - why am I not surprised? - little information and much of it contradictory. While everyone agrees that Heinlein had a rare blood type, few specify what it was. The rarest blood type, at 1% of the Caucasian population, is AB negative.

But that is not universal recipient; it can only receive from Rhesus negative types. AB+ is the universal recipient - for red blood cells. To complicate matters, the situation is , where AB is the universal donor.

A negative type is still a tough hand to be dealt because negative types are rarer than positive types, but several types are harder to donate to than AB-.

So what is the worst type to be for donations? Answer: O negative, which can only receive from O negative, which is 7% of the population. But it is the universal donor. So the type that would have made the most sense for Heinlein to be activist about would be O-, but it seems certain that whatever he was, it wasn't that.

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